Question

am nevoie de un pic de ajutor

Answer 1

1. xy56
x+y=5
x diferit de y
x=1, y=4
x=2, y=3
x=3, y=2
x=4, y=1
x=5, y=0
Numerele sunt: 1456, 2356, 3256, 4156, 5056

2. a) 1234, 2345, 3456, 4567, 5678, 6789
    b) 9876, 8765, 7654, 6543, 5432, 4321

3. ab in baza 10 = a*10+b
ab=5a+3b
egalam
10a+b=5a+3b
5a=2b
Multiplul lui 5 si 2 =10, 20, 30 s.a
a=2
b=5

4. a) 135
    b) 579

123, 234, 345, 456, 567, 678, 789.